11.2-rc2-64bit: Automatic Installation breaks on VirtualBox

[infozorro]

The Automatic Installation of 11.2-rc2 breaks on the VirtualBox. Nothing is possible any more. The break is at 5% (preparation of config) and 17% (automatic config). There is no more information available. The restart produces either the same error or a black screen.

VirtualBox 3.0.8-64bit on openSUSE 11.1-64bit;
GUEST:
language = german,
screen = 1200 x 1024
HOST,
Network is NAS with cable connection on host unplugged at that moment,
USB-keyboard and mouse,
nothing else